First slide

Concept of potential energy

Question

A rectangular block of dimensions 8m $\times$ 4m $\times$ 2m and of density $1.5 g c m^{- 3}$ is lying on horizontal ground. The ratio of maximum to minimum potential energies is

Moderate

A

2:1
B

4:1
C

8:1
D

8:3

Solution

$\begin{array}{l} \frac{U_{max}}{U_{min}} = \frac{m g h_{max}}{m g h_{min}} \\ \frac{U_{max}}{U_{min}} = \frac{\frac{8}{2}}{\frac{2}{2}} = 4 : 1 \end{array}$

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